package main

import "fmt"

var gChan chan int

type data struct {
	u1 string
	u2 string
	n1 int64
}

func main() {
	d := data{}
	fmt.Println("u1 : ", d.u1)
	fmt.Println("n1 : ", d.n1)
	if d.u1 == "" {
		fmt.Println("u1 is ...")
	}
	if d.n1 <= 0 {
		fmt.Println("n1 is ...")
	}
}